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Graphene Oxide Caged Biopolymer Nanocomposite for Purification of Rare Earth Elements from High Grade Egyptian Monazite Concentrate
Journal of Polymers and the Environment ( IF 5.3 ) Pub Date : 2021-04-15 , DOI: 10.1007/s10924-021-02146-x
Ahmed M. Shahr El-Din , Tarek Monir , Emad H. Borai

Rare earth elements (REEs) play a critical role in the applications of advanced materials. In this respect, an eco-friendly calcium/alginate-graphene oxide (Ca/Alg–GO) nanocomposite was prepared for the removal of Th(IV), U(VI) and Fe(III) from rare earth chloride (RECL3) liquor. The high specific surface area and large numbers of oxygen-containing functional groups of GO and alginate make them suitable for the separation of different metal ions. Results obtained from this work showed that the adsorption process was pH dependent where at pH 2.0 selective removal of Th(IV), U(VI) and Fe(III) was achieved with no separation for REEs. Maximum adsorption capacities for Th(IV), U(VI) and Fe(III) using Ca/Alg–GO nanocomposite reached 418.0 mg g−1, 129.0 mg g−1, and 139.0 mg g−1; respectively. Equilibrium isotherm data were best described by Langmuir model exhibiting R2 value of 0.92, 0.96 and 1.00 for Th(IV), U(VI) and Fe(III); respectively. In order to produce impurities-free RECL3 liquor, three consecutive cycles were required to completely remove Th(IV), U(VI) and Fe(III) from the said liquor.



中文翻译:

从高品位埃及独居石精矿中纯化稀土元素的氧化石墨烯笼蔽生物聚合物纳米复合材料

稀土元素(REE)在先进材料的应用中起着至关重要的作用。在这方面,制备了一种生态友好的钙/藻酸盐-氧化石墨烯(Ca / Alg-GO)纳米复合材料,用于从稀土氯化物(RECL 3)中去除Th(IV),U(VI)和Fe(III)。酒。GO和藻酸盐的高比表面积和大量含氧官能团使其适用于分离不同的金属离子。从这项工作中获得的结果表明,吸附过程取决于pH值,其中在pH 2.0时,无需分离REE就可选择性除去Th(IV),U(VI)和Fe(III)。为钍(Ⅳ),U(Ⅵ)和Fe(III)的最大吸附量以Ca / ALG-GO纳米复合材料达到418.0毫克克-1,129.0毫克克-1和139.0 mg g -1 ; 分别。平衡等温线数据最好用Langmuir模型描述,对于Th(IV),U(VI)和Fe(III),R 2值分别为0.92、0.96和1.00。分别。为了生产无杂质的RECL 3液,需要三个连续的循环以从所述液中完全除去Th(IV),U(VI)和Fe(III)。

更新日期:2021-04-15
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